It’s going to be impossible for anyone on this board to asses the level at which you play your repertoire. Looks like you are Canadian - can you get an assessment from a college/conservatory instructor there? What does your teacher say? Orchestra director any help?
The RCM system/syllabus is not typically used here in the US. Many instructors here will not be familiar with the particulars, so speaking in these terms may not have much meaning for them.
As I think you guess, Bruch would be one of the lower level concertos used in top rank US conservatory/college auditions. This is often among the first major concertos US students play - not uncommon to hear it played very well as early as middle school. But, as I said above, it is impossible to tell how well you play this. A wonderful performance of Bruch demonstrating technical and musical mastery as well as good solo Bach (which will also be required in conservatory auditions) and a strong technical etude (Paganini, Wieniawski, etc) might be enough for consideration for some studios. In my opinion, Kabalevsky is not likely to impress an auditioner - to me, choosing that concerto would indicate you had not reached the “major” concerto level of study and playing.
If possible, you should have a lesson with an instructor at Oberlin or Peabody or Jacobs and ask about your chances. Your time is getting short, if I’m reading you correctly - senior year coming up? Check all the audition requirements for the schools you are interested in. You will need to submit pre-screen recordings by December for most.
Also, winning national competitions is not necessary for admittance to the schools you mention - or any schools for that matter. Auditioners may not even know your accomplishments. You will be judged on the playing at your audition.
You should also consider, if you know that you are currently behind technically, how will that be caught up while working on a double degree? There will be many more advanced students than you entering who are not doubling majoring. Will you have enough time to work? Practicing 4 - 6 hours most days is not unusual in conservatories, some students do more than that.
Good luck to you. I admire the self-assessment and objective view that you are taking of yourself.